参数资料
型号: MSC7116VF1000
厂商: Freescale Semiconductor
文件页数: 36/60页
文件大小: 0K
描述: DSP 16BIT W/DDR CTRLR 400-MAPBGA
标准包装: 90
系列: StarCore
类型: 定点
接口: 主机接口,I²C,UART
时钟速率: 266MHz
非易失内存: ROM(8 kB)
芯片上RAM: 400kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.20V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 400-LFBGA
供应商设备封装: 400-MAPBGA(17x17)
包装: 托盘
Hardware Design Considerations
MSC7116 Data Sheet, Rev. 13
Freescale Semiconductor
41
3
Hardware Design Considerations
This section described various areas to consider when incorporating the MSC7116 device into a system design.
3.1
Thermal Design Considerations
An estimation of the chip-junction temperature, TJ, in °C can be obtained from the following:
TJ = TA + (R
θJA × PD)Eqn. 1
where
TA = ambient temperature near the package (°C)
R
θJA = junction-to-ambient thermal resistance (°C/W)
PD = PINT + PI/O = power dissipation in the package (W)
PINT = IDD × VDD = internal power dissipation (W)
PI/O = power dissipated from device on output pins (W)
The power dissipation values for the MSC7116 are listed in Table 4. The ambient temperature for the device is the air
temperature in the immediate vicinity that would cool the device. The junction-to-ambient thermal resistances are JEDEC
standard values that provide a quick and easy estimation of thermal performance. There are two values in common usage: the
value determined on a single layer board and the value obtained on a board with two planes. The value that more closely
approximates a specific application depends on the power dissipated by other components on the printed circuit board (PCB).
The value obtained using a single layer board is appropriate for tightly packed PCB configurations. The value obtained using a
board with internal planes is more appropriate for boards with low power dissipation (less than 0.02 W/cm
2 with natural
convection) and well separated components. Based on an estimation of junction temperature using this technique, determine
whether a more detailed thermal analysis is required. Standard thermal management techniques can be used to maintain the
device thermal junction temperature below its maximum. If TJ appears to be too high, either lower the ambient temperature or
the power dissipation of the chip.
You can verify the junction temperature by measuring the case temperature using a small diameter thermocouple (40 gauge is
recommended) or an infrared temperature sensor on a spot on the device case. Use the following equation to determine TJ:
TJ = TT + (ΨJT × PD)Eqn. 2
where
TT = thermocouple (or infrared) temperature on top of the package (°C)
Ψ
JT = thermal characterization parameter (°C/W)
PD = power dissipation in the package (W)
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